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Ground Loop Temps in Central OH

What is the expected "average" or even "realistic optimal" horizontal closed loop temps in central Ohio throughout the year? This would be for an assumed properly sized loop for a properly sized and properly operating WSHP system. For example, in the last two weeks, with average/normal use, the EWT has been 54.8F. Does anyone have the approximate month to month temp for the heating and cooling season for this area?

I understand there are lots of variables, for example: 20% Methanol is being used as the antifreeze solution. Close counts here...

I would go on the Web Energy Logger site, and see if there are any dots near you that you can view real time data on. The people I have contacted via that site all seem more than willing to talk about their systems and experiances. We just got on there 2 months ago. There is a link on our website if you want to check it out.
Eric